GOT RUNTIME ERROR, please help me!


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    /**
     * Definition for an interval.
     * struct Interval {
     *     int start;
     *     int end;
     *     Interval() : start(0), end(0) {}
     *     Interval(int s, int e) : start(s), end(e) {}
     * };
     */
    class Solution {
    public:
    
    vector<Interval> merge(vector<Interval>& intervals) {
        vector<bool> used;
        used.resize(intervals.size());
        for(int i = 0; i < intervals.size(); i++)
        {
            used[i] = false;
        }
        sort(intervals.begin(), intervals.end(), comp);
        vector<Interval> ret;
        for (int i = 0; i < intervals.size(); i++) {
            if (!used[i]) {
                used[i] = true;
                for(int j = i+1; j < intervals.size();j++)
                {
                    if(!used[j])
                    {
                        if(CanMerge(intervals[i], intervals[j]))
                        {
                            MergeTwo(intervals[i], intervals[j]);
                            used[j] = true;
                        }
                        else
                        {
                            break;
                        }
                    }
                }
                ret.push_back(intervals[i]);
            }
            
        }
        return ret;
    }
    
    bool CanMerge(struct Interval & a, struct Interval & b)
    {
        if(a.start < b.start)
        {
           if(b.start <= a.end)
           {
               return true;
           }
        }
        else
        {
            if(a.start <= b.end )
            {
                return true;
            }
        }
        return false;
    }
    void MergeTwo(struct Interval & a, struct Interval & b)
    {
        if(a.start < b.start)
        {
            if(b.end > a.end)
            {
                a.end = b.end;
            }
        }
        else
        {
            a.start = b.start;
            if( a.end < b.end)
            {
                a.end = b.end;
            }
        }
    }
    
     
    static bool comp(struct Interval & a, struct Interval & b)
    {
        if(a.start <= b.start)
        {
            return true;
        }
        else
        {
            return false;
        }
    }
    };
    

    Why I got runtime error? Please help me.


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